The Tandemkross Shadow Picatinny Rail for Ruger® Mark series and 22/45™ pistols gives you greater flexibility in your choice of optic and in where you position it on your pistol. Eight MIL-STD Picatinny cross-slots give you plenty of leeway in positioning a red dot or other sight for optimal eye relief. Other features of the Shadow Picatinny Rail: Cutout on underside minimizes risk of interference ejected shell casings Shorter, trimmer & better looking than factory optic rail Solid & secure - precision-machined aluminum, hardcoat anodized finish Mounting screws included Available in Matte Black or Matte Gray to match - or contrast with - your gun’s finish Tandemkross designed the Shadow Picatinny Rail so you can install it on your Ruger® Mark series or 22/45™ pistol without removing your gun’s "iron" sights. With a quick-release mount on your optic, you can switch back to shooting with iron sights in seconds. The Shadow Picatinny Rail fits factory drilled and tapped receivers on the following Ruger® .22 LR pistols: Mark II™ Mark II™ 22/45™ Mark III™ Mark III™ 22/45™ Mark III™ 22/45™ Lite Mark IV™ Target Mark IV™ Hunter Mark IV™ Competition Mark IV™ 22/45™ Lite